Balance-wheel pulley for sewing-machines



} EL-FLATHER. Balance-Wheel Pulley forSWing-Machines.

No. 228,184. Pa t'entd-Ju'ne '1, 1880.

" 'NITED STATES PATENT OFFICE.

EDWARD FLATHER, OF BRIDGEPORT, CONNECTICUT.

BALANCE-WHEEL PULLEY FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 228,184, dated June 1, 1880.

' I Application filed November 28, 1879.

To all whom it may concern Be it known that I, EDWARD FLATHER, of the city of Bridgeport, county of Fairfield, State of Connecticut, have invented a new and useful Improvement in Balance-Wheel Pulleys for Sewing-Machines, of which the following is a specification.

The invention relates to a device for operatin g sewing-machines; and it consists of a balance-wheel pulley loosely mounted on the driving-shaft, running independent thereon.

Motion is communicated to the machine by means of a locking-bolt passing through the hub of the pulley and engaging with a flange firmly fixed on the driving-shaft. A hole is provided in said flange for the reception of the end of the locking-bolt. The bolt can be withdrawn, when necessary to run the pulley independent for the purpose of winding bobbins, by pressing on a thumb-pin attached to and projecting at right angles from the lockingbolt, said thumb-pin engaging with an incline plane formed on the hub of the pulley, which withdraws the bolt from the flange.

To more clearly understand my invention reference is bad to the drawings accompanying this specification, in which-- Figure 1 represents a section of the balancewheel pulley. The dotted line 1 (see Fig. 4.) represents the plane of said section. A is the pulley 5 B, the hub C, the driving-shaft D, the flange firmly fixed to said shaft. a is a hub on the flange D, provided with the hole b, (see Fig. 3, which is a plan view of flange D,) for the reception of the end 0 of lockingbolt (1. A raised projection, e, is provided on the hub B, (see Fig. 4,) through which is drilled the hole f for the reception of the locking-bolt d.

Fig. 5 represents a detached view of the locking-bolt d. c is an enlarged end, which engages with the hole I) of flange D. g is a thumb-pin attached to and projecting at right angles from the locking-bolt to operate the same. Said thumb-pin engages with the incline plane h of the hub B, withdrawing the bolt d from the flange D when necessary to run the pulley independent.

Fig. 2 represents the hub B in section, showing the position of the bolt 01 locked in the flange D. The hole f through the hub B is enlarged, forming the shoulder j, which forms a stop for the spring '5. Said spring is placed on the bolt d, between the head 0 and the thumb-pin g, to carry the bolt into the flange when the thumb-pin is released from the incline h. The pulley A is recessed on the inside face to admit the flange D, for economy in width.

The operation of the device is as follows: By pressing on the thumb-pin it moves on the incline plane, withdrawing the bolt and assuming the position shown by the dotted figure K, Fig. 4, resting at the end of the incline against a flat or slightly-concave surface for the reception of the thumb-pin. Releasing the thumb-pin from its resting-place, the pressure of the spring forces it back and locks the bolt in the flange D.

Having thus described my invention, what I claim is- The balance-wheel pulley A, provided with an incline plane, in combination with the thumb-pin g, locking-boltcl,fla11ge D, and shaft 0, substantially as described.

7 EDWARD FLATHER.

Witnesses: A

GEORGE D. PHILLIPS, ALBERT W. STILLMAN. 

